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ELECTROKINETIC REMEDIATION OF PB NEAR THE E-WASTE DISMANTLE SITE WITH FE(NO3)3 AS CATHODE ELECTROLYTE
Zhang, Z., W. Ren, J. Zhang, and Fang Zhu.
Environmental Technology [Published online 4 Aug 2019 prior to print]

This study tested the capabilities of activated carbon fiber (ACF) enhanced electrokinetic technology to remediate Pb-contaminated soil in an e-waste dismantle site. Experiments were conducted using Fe(NO3)3 as catholyte and citric acid-sodium citrate as anolyte under varying conditions of pH value of anolyte, voltage, and the electrode gap. Simultaneously, a group of contrast tests without ACF were set up to investigate the adsorption performance of ACF for Pb. The highest removal rate of Pb after remediation was 80.53% at 4 cm from the anode when the electrode gap was 31 cm, pH value was 3, and the voltage was 28 V, and the total removal rate increased significantly with the decrease of the pH value of anolyte and the increase of voltage. Characterization of ACF after reaction showed that ACF effectively adsorbed heavy metal Pb at 1.42 mg/g. Sequential extraction analysis revealed that Pb mainly existed bound to organic matter and in the residual form in the soil after remediation.



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